Prickly Pear Cactus, Tucson Mountains, Arizona, April 26, 1953

Looking Down Lava Canyon, Grand Canyon, Arizona, June 16, 1967

Boulders and Sand Dune, Granite Rapids, Grand Canyon, Arizona, June 19, 1967

Reflections on Edges of River, Mile 122, Grand Canyon, Arizona, June 22, 1967

Diseased Saguaro, Detail, Saguaro National Monument, Arizona, April 29, 1953

At Lava Canyon Entrance, Grand Canyon, Arizona, June 16, 1967

Senecio meomexicanus, Molino Basin, Catalina Mountains, Arizona, April 15, 1953

Sunset Clouds, Palmer Station, Antarctica, 18 February 1976

Neumayer Passage from Research Vessel "Hero", Antarctica, February 25, 1976

Moss and Lichens, Shortcut Island, Antarctica, February 1976

Icebergs, Ross Sea, from U.S. Coast Guard Cutter "Glacier," January 1976

Volcanic Boulders, Deception Island, Antarctica, February 26, 1976

Deer Creek Falls, Grand Canyon, Arizona, June 24, 1967

Polished Rocks, Travertine Falls, Grand Canyon, Arizona, June 29, 1967

Large Square Boulder, Tuckup Canyon, Grand Canyon, Arizona, September 21, 1967

Bottom of Falls, Travertine Falls, Grand Canyon, Arizona, September 23, 1967

Sculptured Schist, Lower Granite Gorge, Grand Canyon, Arizona, June 29, 1967

Deer Creek Gorge, Grand Canyon, Arizona, September 19, 1967

Thunder River Falls, Grand Canyon, Arizona, June 23, 1967

Matcatameba Canyon, Lower Grand Canyon, Arizona, June 28, 1967